Neighbors who heard the shot called police early Tuesday and the unidentified 37-year-old victim first told officers someone had shot him, said police spokesman Constable Blair Good.
However, it was determined there was no other suspect, the Winnipeg Sun reported.
"He was handling the handgun incorrectly and he shot himself in the (right bicep)," Good said.
The man said he wanted about eight guests to leave and so he brought out a gun, although his intentions weren't clear, Good said.
However, he was successful in clearing the house, as everyone ran after the shooting, the Sun said.
I think a supersoaker would have been just as effective and much less painful.